Stages of Chronic Kidney Disease (CKD)
Understanding where you are on the CKD spectrum is the first step toward protecting your kidney health and planning for the future.
Chronic kidney disease (CKD) is a progressive condition in which the kidneys gradually lose their ability to filter waste products, excess fluids, and electrolytes from the blood. Affecting approximately 37 million adults in the United States — roughly 1 in 7 — CKD develops over months to years and is classified into five stages based on the glomerular filtration rate (GFR), a measure of how effectively the kidneys are filtering blood. Early stages often produce no symptoms, which is why CKD is frequently called a "silent disease." By the time symptoms appear, significant kidney function may already be lost.
This guide explains each stage of CKD, the symptoms you may experience, what your GFR numbers mean, and when dialysis or other interventions become necessary. If you or a loved one has been diagnosed with kidney disease at any stage, understanding the progression can help you make informed decisions about your care.
Understanding GFR (Glomerular Filtration Rate)
GFR stands for glomerular filtration rate — it measures how many milliliters of blood your kidneys filter per minute. It is the single most important number for staging kidney disease and tracking its progression.
Your GFR is calculated using a blood test for creatinine (a waste product from muscle metabolism) combined with your age, sex, race, and body size. A normal GFR is 90 mL/min or higher. As kidney function declines, GFR drops, and waste products accumulate in the blood.
GFR is not a static number — it can fluctuate based on hydration, medications, diet, and acute illness. A single low reading does not necessarily mean CKD. Diagnosis requires a sustained reduction in GFR (below 60 mL/min) or evidence of kidney damage (such as protein in the urine) persisting for at least three months.
How is GFR measured?
Your doctor orders a simple blood test called a serum creatinine test. The lab uses the result — along with your age, sex, and race — to calculate your estimated GFR (eGFR) using the CKD-EPI equation, the most widely accepted formula. No special preparation is needed. The test is part of routine metabolic panels and is often how CKD is first detected.
The 5 Stages of CKD at a Glance
| Stage | GFR Range (mL/min) | Kidney Function Level | Key Actions |
|---|---|---|---|
| Stage 1 | 90 or higher | Normal function with signs of kidney damage | Monitor and manage risk factors |
| Stage 2 | 60 – 89 | Mildly decreased | Lifestyle changes, regular monitoring |
| Stage 3a | 45 – 59 | Mild to moderate decrease | See a nephrologist, manage complications |
| Stage 3b | 30 – 44 | Moderate to severe decrease | Prepare for possible progression |
| Stage 4 | 15 – 29 | Severely decreased | Prepare for dialysis or transplant |
| Stage 5 | Less than 15 | Kidney failure (ESKD) | Dialysis or kidney transplant needed |
Stage 1 CKD — GFR 90+ mL/min
In stage 1, kidney function is still normal or near-normal, but there is evidence of kidney damage. This evidence may include protein in the urine (proteinuria or albuminuria), blood in the urine (hematuria), structural abnormalities visible on imaging, or a known genetic condition such as polycystic kidney disease.
Symptoms
Stage 1 CKD typically produces no noticeable symptoms. Most patients are diagnosed incidentally through routine blood or urine tests. Occasionally, foamy urine (a sign of protein leakage) or mild swelling may be present.
What to Do
- Control blood pressure (target below 130/80 mmHg for most patients)
- Manage blood sugar if diabetic (A1C below 7% is a common target)
- Adopt a kidney-friendly diet — reduce sodium, stay hydrated
- Avoid nephrotoxic medications (NSAIDs, certain antibiotics) without medical guidance
- Schedule regular follow-ups with your primary care physician
Stage 2 CKD — GFR 60–89 mL/min
Stage 2 indicates a mild reduction in kidney function along with evidence of kidney damage. The kidneys are still working well enough to maintain most normal functions, but the decline from stage 1 signals that the damage is affecting filtration capacity.
Symptoms
Like stage 1, stage 2 CKD is usually asymptomatic. Some patients may notice slightly increased urination at night (nocturia) or mild fatigue, but these symptoms are nonspecific and often attributed to other causes.
What to Do
- Continue all stage 1 interventions — blood pressure and blood sugar control remain critical
- Begin tracking GFR trends over time (a consistent decline warrants attention)
- Exercise regularly — 30 minutes of moderate activity most days
- Stop smoking — smoking accelerates kidney function decline
- Discuss ACE inhibitor or ARB therapy with your doctor if you have proteinuria
Stage 3 CKD — GFR 30–59 mL/min
Stage 3 is the most commonly diagnosed stage of CKD and is divided into two substages. Stage 3a (GFR 45–59) represents a mild to moderate decrease in function. Stage 3b (GFR 30–44) indicates a moderate to severe decrease. This distinction matters because stage 3b carries a significantly higher risk of progression to kidney failure.
Stage 3 is the point at which the kidneys begin to struggle with tasks beyond basic filtration — including regulating calcium and phosphorus levels, producing adequate erythropoietin (the hormone that stimulates red blood cell production), and maintaining acid-base balance.
Symptoms
Many stage 3 patients begin to experience noticeable symptoms for the first time:
- Fatigue and low energy levels
- Swelling in the hands, feet, or ankles (edema)
- Changes in urination — more or less frequent, darker or foamy urine
- Mild to moderate back or flank pain
- Difficulty sleeping
- Loss of appetite or mild nausea
- Muscle cramps, especially at night
What to Do
- See a nephrologist — specialist care is essential starting at stage 3
- Begin monitoring potassium, phosphorus, calcium, and hemoglobin levels
- Adopt a renal diet — limit sodium, potassium, and phosphorus as directed
- Treat anemia if hemoglobin drops (erythropoiesis-stimulating agents may be prescribed)
- Manage bone health — vitamin D supplementation and phosphate binders as needed
Stage 4 CKD — GFR 15–29 mL/min
Stage 4 represents a severe reduction in kidney function. At this point, the kidneys are filtering only a fraction of what they should, and waste products are accumulating at levels that produce clear symptoms. Stage 4 is the critical planning stage — this is when you and your nephrologist begin preparing for renal replacement therapy (dialysis or transplant).
Symptoms
Stage 4 symptoms are more pronounced and may significantly affect daily life:
- Persistent fatigue and weakness
- Significant swelling in legs, ankles, and around the eyes
- Nausea, vomiting, and decreased appetite
- Metallic taste in the mouth
- Difficulty concentrating or mental fogginess
- Shortness of breath (from fluid buildup or anemia)
- Itching (pruritus) due to phosphorus buildup
- Numbness or tingling in extremities
- High blood pressure that is difficult to control
What to Do
- Choose a dialysis modality — in-center hemodialysis, home hemodialysis, or peritoneal dialysis
- Plan dialysis access — an AV fistula should ideally be created 6 months before dialysis starts
- Explore kidney transplant evaluation — get on the waitlist if eligible
- Meet with a renal dietitian for a strict dietary plan
- Discuss social work and financial counseling for dialysis planning
Stage 5 CKD — GFR Below 15 mL/min (Kidney Failure)
Stage 5 CKD, also known as end-stage kidney disease (ESKD) or end-stage renal disease (ESRD), means the kidneys have lost nearly all of their filtering capacity. Without renal replacement therapy — dialysis or a kidney transplant — the accumulation of toxins, fluid, and electrolyte imbalances becomes life-threatening.
Symptoms
Stage 5 symptoms are severe and affect virtually every organ system:
- Extreme fatigue and weakness — difficulty performing daily activities
- Severe nausea, vomiting, and near-complete loss of appetite
- Confusion, difficulty concentrating, or altered mental status (uremic encephalopathy)
- Significant fluid retention — swelling in the face, abdomen, and extremities
- Dangerously high potassium levels (risk of cardiac arrhythmia)
- Persistent itching and skin discoloration
- Little to no urine output
- Chest pain or pressure (from fluid around the heart)
- Uncontrollable high blood pressure
What to Do
- Begin dialysis — your nephrologist will determine the optimal time based on symptoms and lab values
- Continue pursuing kidney transplant evaluation if applicable
- Follow a strict renal diet to control potassium, phosphorus, sodium, and fluid intake
- Lean on your care team — nephrologist, dietitian, social worker, and nursing staff
When Is Dialysis Needed?
Dialysis is typically needed when CKD reaches stage 5 — but the decision is not based on GFR alone. Your nephrologist considers the full clinical picture:
- Symptoms: Are uremic symptoms (nausea, confusion, fatigue) significantly affecting your quality of life?
- Lab values: Are potassium, phosphorus, or acid levels dangerously elevated despite medication?
- Fluid management: Is the body retaining fluid that medications can no longer control?
- Nutritional status: Are you losing weight unintentionally or unable to maintain adequate nutrition?
Some patients with a GFR near 15 feel relatively well and can safely defer dialysis with close monitoring. Others with a GFR of 10–15 may need to start sooner due to severe symptoms. The goal is to begin dialysis at the right time for you — not too early (which adds unnecessary burden) and not too late (which risks dangerous complications).
Early referral to a nephrologist and proactive planning — choosing a modality, creating vascular access, understanding your insurance coverage — leads to better outcomes and a smoother transition when the time comes.
CKD Risk Factors
Understanding your risk factors is essential for early detection and prevention. The following conditions and characteristics increase the likelihood of developing CKD.
Diabetes
The leading cause of CKD in the United States. Chronically elevated blood sugar damages the tiny blood vessels in the kidneys over time.
High Blood Pressure
The second leading cause. Uncontrolled hypertension forces the kidneys to work harder and damages the nephrons responsible for filtration.
Family History
A family history of kidney disease, polycystic kidney disease, or kidney failure increases your genetic risk.
Age Over 60
Kidney function naturally declines with age. Adults over 60 are at higher risk and should have regular kidney function screening.
Race & Ethnicity
African Americans, Hispanic Americans, and Native Americans have higher rates of CKD, partly due to higher rates of diabetes and hypertension.
Other Factors
Heart disease, obesity, smoking, recurrent kidney infections, prolonged NSAID use, and autoimmune conditions also increase risk.
How Crown Dialysis Helps CKD Patients
At Crown Dialysis Center in Boca Raton, Dr. Bharat K. Gupta — a board-certified nephrologist with over 25 years of experience, Cleveland Clinic trained and Albert Einstein fellow — manages patients at every stage of chronic kidney disease.
For patients in stages 1 through 4, Dr. Gupta provides ongoing nephrology care focused on slowing progression, managing complications, and preparing for the future. When dialysis becomes necessary, the transition is seamless — because the same doctor who has been managing your CKD will oversee your dialysis treatment.
Crown offers all three major dialysis modalities, so you have options that fit your medical needs and lifestyle:
In-Center Hemodialysis
Private treatment rooms with heated massage chairs, Netflix, HBO, free Wi-Fi, and free round-trip transportation. No shared bays.
Staff-Assisted Home Hemodialysis
A licensed dialysis nurse comes to your home for every treatment. No care partner needed. All supplies delivered.
Peritoneal Dialysis
Home-based treatment with thorough training and ongoing support. Many patients perform overnight exchanges while sleeping.
One doctor. Every stage. Every modality. Continuity of care from diagnosis through treatment is one of the most important factors in CKD outcomes — and it is the foundation of how Crown Dialysis operates.
Frequently Asked Questions About CKD
Can CKD be reversed?
What GFR level requires dialysis?
How fast does CKD progress?
What's the life expectancy with stage 3 CKD?
When should I see a nephrologist?
Can diet slow CKD progression?
Concerned About Your Kidney Health?
Whether you've just been diagnosed with CKD or need to explore dialysis options, Dr. Gupta and the Crown Dialysis team are here to help. Schedule a consultation today.
